Horn



May 14, 1929. w. SPARKS 1,712,906

HORN

Filed NOV. 24, 1925 1 l l l l l la A, miz

A i l $155. ...d 'Il I frTaR/vevs Patented May i4,

UNITED STATES PATENT GFFlCliL WILLIAI SPAR E, 0F JACKSQN, MICHIGAN,AELWHGNOR TO SPARKFi-WITHNGTON CDMPANY, OF CLEVELLWD, HO, A CllORi'lTIONF 13H10.

HRN.

Application filed November 24, 19%. Serial No. @TG3/iid This inventionrelates to certain improvements in horns or signaling devices.

The priinary object of this invention is the production of an improvedstructure whereby a more desirable7 `eilicient and satisfactorylubrication oi the cani carrying shaft and its bearings: is ellected.

Other objects and advantages relate to the details oi the structurereferred to, all as will more fully appear from the YollovTn ingdescription taken in connection With the aecon'ipanying drawings inWhieh:-

Figure l is a top plan vien7 of the horn or signaling device.

Figure 2 is a section on line 22, Fig;rw ure l.

Figure 8 ure l.

Figure 4C is a longitudinal section through Figure l taken at rightangles to Figure 3.

The general structure et horn or signalingdevice here illustrated is thesaine as that disclosed in luy eo-pending application, Serial Number493,498 liled August 18, 11,923. and comprises a resinator mi, a troutdiaphragm case section -2-, a diaphragm -3, a rear diaphragm case section Jl-f termed with a pair et spaced openings for the reception ottthe refipective threaded end portions -5A4 aud o ot' a pressed .metallul-shaped motor lield or yole 7-, the nuts -8 engaging; the threadedends oi the lield -7- to rigidly connect the same to the reardiaphragn'i section -f'd-. i

The motor lield -7- carries the usual pole pieces --9y field coils -l0qand `coinmutator hrushesM-llm all as shown, described. and claimed inLetters Patent is sued to nie lUctober l2, 1920, llulnber 1,355,283.

rlhe armature l2 of the motor' is mounted upon the armature shaft m18 inthe usual manner and the shaft 'l3-`-, has one end extending` throughthe roar wall -llof the niotor ield and its opposite end extendingthrough an opening in the rear diaphragm case section -fl-, andliournaled in a manner to be hereinafter described l he armature shaft-l43 carries at a is a section on line 3 3, Fig'- point forward of thecase section -4l-, a cani or tooth member ml5 adapted to contact whenrotated with a projection or Wear piece 16M upon the central portion etthe diaphragm to eleet vibration of the latter upon rotation of the cam.

rlhe cani may be held upon the armature shaft in any suitable way bymeans ot a nut l7.

The brushes --llare adapted to contact with the connnulator M19 upon thearmature shalt. l i

For the purpose ol; effecting desired ad justinent of the armature shaftMlto vary the relative position of the cani l5* and the Wear piece --lGwto thereby produce the desired displacement or vibfation of the lutter',l have illustrated an end thrust bearing, the broad claims ior whichbearing are contained in iny application Serial Number 93,953 andconsistingoit a bar w20- oiitending substantially parallel with the rearwall lelolf the ilshaped motor lield and having1 one end -2l bent "'f atsubstantially right angles to the body of the bar and termed with thereduced portion M21 extended through an openinig in the rear wall Mldsoas to slide therein, but adapted to liinit `nloi'feincait elI the bearing` in a direction longitudinal of the length of the bar.

Preferably, as illustrated, the bar M20- is of somewhat channel toi-1nand has one ci its ends with a depressed portion -lw adapted to receiveand retain one end el a spring Q2`- positioned between the tree end. ofthe bar *2G- and the rear Wall -lLl-m Preferably, the springl :isdisposed on the opposite side of shaft l3-- from the hanged end 2lthatextends through the Wall Milllnterinediate the spring; and the Bangedend -2, the shalt -jlbears against the bar 20 and for the purpose ofineving the bar toward the Wall *Llli have provided a threaded stud *23madapted to have an adjustable threaded engagement with the rear Wall-lfl and to extend through the bar -20--- This stud comprises anenlarged head portion -24- provided with a slot'for the reception ofrotating means, the said head adapted to project through an opening inthe case or cover -70- to permit adjustment Without removal of thecover.

In order to effect predetermined fine degrecs of adjustment. and holdthe parts frictionally interlocked at other times, I have provided aratchet mechanism comprising a strap -2G- which extends across the bar-20- and has its end bent at substantially right angles to its laterallyeX- tending portion so as to lie in substantial contact with the edgesof the bar -20-.

The upper portion of this strap, or adjusting member is providedpreferably,

tively rigid' position to prevent rattling during use, I have provided aspring member ,3l`- as shown in the form of an elongated plate, havingan intermediate bend, one end of .which spring bar is mounted on thethreaded end -5- of the motor field at vthe rear ofthe nut -8, theopposite end of said bar contacting with the front end of the armatureshaft -13--, the bar being so tensionedas to exert a thrust force uponsaid ,shaft tending to hold it in contact with the Y thrust bearing atthe rear end of the shaft.

This spring and its arrangement constitute claimed subject matter of myco-pending application Serial Number 396,802 filed July 16, 1920. l

In this construction of horn, it is heretofore been customary, asillustrated in my said cospending applications and my said patent toform the rear diaphragm case section of dish-shape and with asubstantially circuwall the forward portion of the armature shaft 13,his journalcd.

In the present construction, for the purpose of lubricating the forwardportion of the `armature shaft and providing an etlicient bearing forit, the circular flat bottom wall .-36--v is formedY with a depressedportion -37 of somewhat rectangular form, the said depressed portionforming a chamber that is preferably somewhat deeper at the oppositeends of the rectangle and is comparatively shallow at its centralportion and formed at it-s centrall portion with an opening throughwhich the arinulurc shaft -l3- extends, the opening` being preferably ofgreater diameter than the shaft.

By making the depression shallow at its central portion, it is notnecessary to lengthen the armature sl aft to any appreciable extent inordci to form lhc .lubricant chamber for effecting lubrication of thebearing -38 for the armature shafl.

The bearing -3S is formed in a plalo 39- that in this particular.illustration is of somewhat rectangular form conformingr to the shapeof the chamber produced by depressing the portion 3T- of thc Vall 3G-and this plato is of the size prefer ably extending both laterally andlongitudinally beyond the depref-.sscd portion to forni a closed chamberexcept for the opening in the depressed portion -BT-d through which thearmature shaft extends and for the bcarential flange pressed at rightangles to the body of the plate -3f)- forming au clougated bearingsurface.

In addition to the bearing and openingr through which the armature.shaft extends, the o pposite longitudinal ends of thc depressed portion-37- are formed with oil passages or openingsv -4t()- which lead to thechamber formed between the depressed portion -37- and the plate 259- andpreferably this chamber contains a wick or sheet of felt or otherlubricant-retaining niaterial which surrounds the shaft i3- The plate39- may be secured to the bottom wall 8G- in any suitable way as bymeans of bolts or rivets -i-lwhich cxtend through the plate in thebottom wall at the opposite ends of the plate.

It will be obvious that the bearing 38- and the shaft 13- may be readilylubricated through opcnings -U- at any tinie when the cover 70- removedand the lubricant-retaining material in thc chamber will maintain theshaft .in luln'icalcd condition for long periods of time.

Although I have shown und described a specific form and construction ofthe parts as illustrative of a perhaps prcirrcd cmbodiment of myinvention, I do not desire, to restrict myself to (he dclailrfl offorni, shape or arrangement of `the paris` for the reason that so far asI :un aware. l :uu the first to form a wick or felt-couhiiniug chainberat the forward end ol' (he uiolor .shaft for lubricating (he shaftbearing. and particularly when that chambe' is formed b v offsetting aportion of the bottom wall of the (iliaphragm case and closing thechamber by means of a plate that is formed with a bearing for thearmature shaft.

I claim:

A horn structure comprising` a rear diaphragm case section of dishedform, and having a generally flat circular rear Wall proeided with :Lcentral depressed portion7 a plate rigidly and permanently securedacross the forward side of the depressed portion to form a lubricantchamber, the rear part oi the depressed portion being inclined in-Werdly from its edges towards the plate, a

